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From Igor Cicimov <icici...@gmail.com>
Subject Re: [users@httpd] Example Apache reverse proxy configuration for HTTPS frontend and several HTTP backends
Date Mon, 09 Mar 2015 21:42:43 GMT
On 10/03/2015 4:13 AM, "A M" <amm.priv2@gmail.com> wrote:
>
>
> Hello,
>
> thanks to the comments of Igor, I was able to overcome the HTTPS
redirection
> to the initial page of the right backend server, with one modification:
>
> Igor's recipe included advice on how to set up the correct VirtualHost
blocks
> using the wildcard *.example.com key/cert pair. This worked. He also
suggested
> to use the following redirection method:
>
>
> <VirtualHost *:80>
>      ServerName apachefrontend.example.com
>      ServerAlias appserver1.example.com appserver2.example.com
>      RedirectMatch ^/(.*) https://%{HTTP_HOST}/$1
> </VirtualHost>
>
> This did not work, when trying to reach the server, the request is
> being redirected to https://%25{http_host}/..
>
> Instead, I have achieved the goal with the help of RewriteEngine:
>
> <VirtualHost *:80>
> RewriteEngine On
> RewriteCond %{HTTPS} off
> RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI}
> </VirtualHost>
>
>
> This change, together with the correct VirtualHost blocks had brought
> me finally to the front page of the backend servers via HTTPS. However,
when
> trying to navigate inside them, I am being forwarded to:
>
>          http://appserverX.backend/Something
>
> instead of
>
>          https://apachefrontend.example.com/Something
>

That is correct. Now I suggest we stop here and you tell us what exactly
you want to achieve. You need reverse proxy for multiple backend servers
(domains) running different apps or you just need frontend load balancer
for backend servers running same apps? Or you are just testing some
scenarios and learning apache?

> and the site becomes unusable. I assume that to conclude the rev. proxy
> configuration task I have to add further rewrite rules. Could someone
> comment on this? The current (working) httpd.conf is quoted below.
>
> Thanks ahead!
>
> Andy.
>
>
> ....
> # Proxy-related load pack
> LoadModule headers_module    modules/mod_headers.so
> LoadFile   /usr/lib64/libxml2.so
> LoadModule proxy_module modules/mod_proxy.so
> LoadModule proxy_http_module modules/mod_proxy_http.so
> LoadModule proxy_html_module modules/mod_proxy_html.so
> LoadModule proxy_balancer_module modules/mod_proxy_balancer.so
> LoadModule proxy_ajp_module modules/mod_proxy_ajp.so
> #LoadModule proxy_ftp_module modules/mod_proxy_ftp.so
> #LoadModule proxy_connect_module modules/mod_proxy_connect.so
>
> # General SSL options transferred from ssl.conf for better viewing
> Listen 443
> SSLPassPhraseDialog  builtin
> SSLSessionCache         shmcb:/var/cache/mod_ssl/scache(512000)
> SSLSessionCacheTimeout  300
> SSLMutex default
> SSLRandomSeed startup file:/dev/urandom  256
> SSLRandomSeed connect builtin
> SSLCryptoDevice builtin
>
> NameVirtualHost *:80
> NameVirtualHost *:443
>
> # Decide which virtual host to address and enforce usage of port 443 on
the right proxy host
> <VirtualHost *:80>
> RewriteEngine On
> RewriteCond %{HTTPS} off
> RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI}
> </VirtualHost>
>
>
> # Our "Mother host", apachefrontend.example.com, is still available for
hosting of some web site
> <VirtualHost *:443>
> ServerName apachefrontend.example.com
>
> ErrorLog logs/ssl_error_log
> TransferLog logs/ssl_access_log
> LogLevel warn
> SSLEngine on
> SSLProtocol all -SSLv2 -SSLv3
> SSLCipherSuite ALL:!ADH:!EXPORT:!SSLv2:RC4+RSA:+HIGH:+MEDIUM:+LOW
> SSLCertificateFile /etc/pki/tls/certs/localhost.crt
> SSLCertificateKeyFile /etc/pki/tls/private/localhost.key
> <Files ~ "\.(cgi|shtml|phtml|php3?)$">
>     SSLOptions +StdEnvVars
> </Files>
> <Directory "/var/www/cgi-bin">
>     SSLOptions +StdEnvVars
> </Directory>
> SetEnvIf User-Agent ".*MSIE.*" \
>          nokeepalive ssl-unclean-shutdown \
>          downgrade-1.0 force-response-1.0
> CustomLog logs/ssl_request_log \
>           "%t %h %{SSL_PROTOCOL}x %{SSL_CIPHER}x \"%r\" %b"
> </VirtualHost>
>
>
> # Appserver 1
>
> <VirtualHost *:443>
> ServerName appserver1.example.com
> ErrorLog logs/ssl_error_log
> TransferLog logs/ssl_access_log
> LogLevel warn
> SSLEngine on
> SSLProtocol all -SSLv2 -SSLv3
> SSLCipherSuite ALL:!ADH:!EXPORT:!SSLv2:RC4+RSA:+HIGH:+MEDIUM:+LOW
> SSLCertificateFile /etc/pki/tls/certs/localhost.crt
> SSLCertificateKeyFile /etc/pki/tls/private/localhost.key
>
> ProxyRequests Off
> ProxyPass / http://appserver1.backend/
> ProxyPassReverse / http://appserver1.backend/
>
> </VirtualHost>
>
>
> # Appserver 2
>
> <VirtualHost *:443>
> ServerName appserver2.example.com
> ErrorLog logs/ssl_error_log
> TransferLog logs/ssl_access_log
> LogLevel warn
> SSLEngine on
> SSLProtocol all -SSLv2 -SSLv3
> SSLCipherSuite ALL:!ADH:!EXPORT:!SSLv2:RC4+RSA:+HIGH:+MEDIUM:+LOW
> SSLCertificateFile /etc/pki/tls/certs/localhost.crt
> SSLCertificateKeyFile /etc/pki/tls/private/localhost.key
>
> ProxyRequests Off
> ProxyPass / http://appserver2.backend/
> ProxyPassReverse / http://appserver2.backend/
>
> </VirtualHost>
>
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> On Mon, Mar 9, 2015 at 10:55 AM, Igor Cicimov <icicimov@gmail.com> wrote:
>>
>>
>> On 09/03/2015 8:01 PM, "A M" <amm.priv2@gmail.com> wrote:
>> >
>> >
>> > Hello Jeff,
>> >
>> > this is what happens:
>> >
>> > [root@www httpd]# service httpd start
>> > Starting httpd: [Mon Mar 09 09:51:53 2015] [warn] module
headers_module is already loaded, skipping
>> > [Mon Mar 09 09:51:53 2015] [warn] module proxy_html_module is already
loaded, skipping
>> > [Mon Mar 09 09:51:53 2015] [warn] module ssl_module is already loaded,
skipping
>> > [Mon Mar 09 09:51:53 2015] [warn] _default_ VirtualHost overlap on
port 443, the first has precedence
>> > [Mon Mar 09 09:51:53 2015] [warn] _default_ VirtualHost overlap on
port 443, the first has precedence
>> >                                                            [FAILED]
>> >
>>
>> First looks like you have same configuration included twice somewhere.
>>
>> > And then there is only one line in the error log:
>> >
>> > [Mon Mar 09 09:51:53 2015] [error] Server should be SSL-aware but has
no certificate configured [Hint: SSLCertificateFile] ((null):0)
>> >
>> > "apachectl configtest" gives me the same infos as "apachectl -S".
>> >
>> > Following the last advice of Igor, I assume that I'll have to generate
two other certificates,
>> > one for appserver1.example.com, and another - for
appserver2.example.com, and then
>>
>> Or use the same certificate if you were clever enough to generate a wild
card one ie *.example.com since you need to front multiple subdomains of
the same domain ;-)
>>
>> > add a reference to them in the VirtualHost *443 definition for these
two aliased servers.
>>
>> Correct, also please refer to the ssl vhost section on the apache web
site so you fully understand the subject. It's also recommended you make
your self familiar with SNI.
>>
>> > Will try it later in the day..
>> >
>> > Greetings - Andy.
>> >
>> >
>> >
>> >
>> >
>> >
>> > On Mon, Mar 9, 2015 at 5:22 AM, jeffmonte101 . <jeffmonte101@gmail.com>
wrote:
>> >>
>> >> Andy,
>> >>
>> >> What do you see in error logs and proxy logs when you try to bring up
the web server?
>> >>
>> >>
>> >>
>> >> On Sun, Mar 8, 2015 at 5:11 PM, A M <amm.priv2@gmail.com> wrote:
>> >>>
>> >>>
>> >>> Hello Igor, and many thanks for your comment!
>> >>>
>> >>> I have followed your advice, but now the server refuses to start at
all.
>> >>>
>> >>> So now I have in httpd.conf:
>> >>>
>> >>> ------------------------------------------------
>> >>> NameVirtualHost *:80
>> >>>
>> >>> <VirtualHost *:80>
>> >>>      ServerName apachefrontend.example.com
>> >>>      ServerAlias appserver1.example.com appserver2.example.com
>> >>>      RedirectMatch ^/(.*) https://%{HTTP_HOST}/$1
>> >>> </VirtualHost>
>> >>>
>> >>> <VirtualHost *:443>
>> >>>      ServerName appserver1.example.com
>> >>>      ProxyRequests Off
>> >>>      ProxyPass / http://appserver1.backend
>> >>>      ProxyPassReverse / http://appserver1.backend
>> >>> </VirtualHost>
>> >>>
>> >>> <VirtualHost *:443>
>> >>>      ServerName appserver2.example.com
>> >>>      ProxyRequests Off
>> >>>      ProxyPass / http://appserver2.backend
>> >>>      ProxyPassReverse / http://appserver2.backend
>> >>> </VirtualHost>
>> >>>
>> >>>
------------------------------------------------------------------------
>> >>>
>> >>> And these uncommented lines in ssl.conf:
>> >>>
>> >>>
-----------------------------------------------------------------------
>> >>>
>> >>> LoadModule ssl_module modules/mod_ssl.so
>> >>> Listen 443
>> >>> SSLPassPhraseDialog  builtin
>> >>> SSLSessionCache         shmcb:/var/cache/mod_ssl/scache(512000)
>> >>> SSLSessionCacheTimeout  300
>> >>> SSLMutex default
>> >>> SSLRandomSeed startup file:/dev/urandom  256
>> >>> SSLRandomSeed connect builtin
>> >>> SSLCryptoDevice builtin
>> >>>
>> >>> <VirtualHost _default_:443>
>> >>> ServerName apachefrontend.example.com:443
>> >>>
>> >>> ErrorLog logs/ssl_error_log
>> >>> TransferLog logs/ssl_access_log
>> >>> LogLevel warn
>> >>>
>> >>> SSLEngine on
>> >>> SSLProtocol all -SSLv2 -SSLv3
>> >>> SSLCipherSuite ALL:!ADH:!EXPORT:!SSLv2:RC4+RSA:+HIGH:+MEDIUM:+LOW
>> >>> SSLCertificateFile /etc/pki/tls/certs/localhost.crt
>> >>> SSLCertificateKeyFile /etc/pki/tls/private/localhost.key
>> >>>
>> >>> <Files ~ "\.(cgi|shtml|phtml|php3?)$">
>> >>>     SSLOptions +StdEnvVars
>> >>> </Files>
>> >>>
>> >>> <Directory "/var/www/cgi-bin">
>> >>>     SSLOptions +StdEnvVars
>> >>> </Directory>
>> >>>
>> >>> SetEnvIf User-Agent ".*MSIE.*" \
>> >>>          nokeepalive ssl-unclean-shutdown \
>> >>>          downgrade-1.0 force-response-1.0
>> >>>
>> >>> CustomLog logs/ssl_request_log \
>> >>>           "%t %h %{SSL_PROTOCOL}x %{SSL_CIPHER}x \"%r\" %b"
>> >>>
>> >>> </VirtualHost>
>> >>>
>> >>>
-----------------------------------------------------------------------------------
>> >>>
>> >>> [root@www conf]# apachectl -S
>> >>>
>> >>> [Sun Mar 08 12:28:37 2015] [warn] module headers_module is already
loaded, skipping
>> >>> [Sun Mar 08 12:28:37 2015] [warn] module proxy_html_module is
already loaded, skipping
>> >>> [Sun Mar 08 12:28:37 2015] [warn] module ssl_module is already
loaded, skipping
>> >>> [Sun Mar 08 12:28:37 2015] [warn] _default_ VirtualHost overlap on
port 443, the first has precedence
>> >>> [Sun Mar 08 12:28:37 2015] [warn] _default_ VirtualHost overlap on
port 443, the first has precedence
>> >>> VirtualHost configuration:
>> >>> wildcard NameVirtualHosts and _default_ servers:
>> >>> _default_:8443         apachefrontend.example.com
(/etc/httpd/conf.d/nss.conf:84)
>> >>> _default_:443          apachefrontend.example.com
(/etc/httpd/conf.d/ssl.conf:74)
>> >>> *:443                  appserver1.backend
(/etc/httpd/conf/httpd.conf:1034)
>> >>> *:443                  appserver2.backend
(/etc/httpd/conf/httpd.conf:1041)
>> >>> *:80                   is a NameVirtualHost
>> >>>          default server apachefrontend.example.com
(/etc/httpd/conf/httpd.conf:1028)
>> >>>          port 80 namevhost apachefrontend.example.com
(/etc/httpd/conf/httpd.conf:1028)
>> >>>                  alias appserver1.example.com
>> >>>                  alias appserver2.example.com
>> >>> Syntax OK
>> >>>
>> >>> .. and the server refuses to start at all..
>> >>>
>> >>> Playing with NameVirtualHost: *.443 and/or specifying explicitly
server names
>> >>> with ServerName does not help me tp get rid of the overlap on 443.
At most, I
>> >>> am receiving the missing SSL support errors for the backend servers
(and I
>> >>> cannot add SSL support for them, they have to remain plain HTTP)..
>> >>>
>> >>> If you have any further ideas on what to try, please let me know.
>> >>>
>> >>> Thanks again and best regards - Andy.
>> >>>
>> >>>
>> >>>
>> >>> On Sun, Mar 8, 2015 at 2:05 AM, Igor Cicimov <icicimov@gmail.com>
wrote:
>> >>>>
>> >>>>
>> >>>> On 08/03/2015 10:01 AM, "A M" <amm.priv2@gmail.com> wrote:
>> >>>> >
>> >>>> >
>> >>>> > Hello experts,
>> >>>> >
>> >>>> > I am trying to set up a classical frontend HTTPS Apache Reverse
Proxy
>> >>>> > for a couple of plain backend HTTP servers sitting on a backend
private
>> >>>> > network. The plaform is Centos 6, the Apache rpm is
httpd-2.2.15-39.el6.centos.
>> >>>> >
>> >>>> > I first created three DNS entries, all pointing to the same
public IP:
>> >>>> >
>> >>>> >          apachefrontend.example.com
>> >>>> >          appserver1.example.com
>> >>>> >          appserver2.example.com
>> >>>> >
>> >>>> > I then generated the SSL cert and key for the frontend host
and
verified that
>> >>>> > SSL config was correct (all settings and key/cert were defined
inside the file
>> >>>> > /etc/httpd/conf.d/ssl.conf). The URL "
https://apachefrontend.example.com"
>> >>>> > replied OK.
>> >>>> >
>> >>>> > I have then set up a forced redirection to port 443 on the
mother
>> >>>> > server and defined two virtual hosts, in this manner:
>> >>>> >
>> >>>> > ..
>> >>>> > NameVirtualHost *:80
>> >>>> >
>> >>>>
>> >>>> First change this:
>> >>>>
>> >>>> > <VirtualHost *:80>
>> >>>> >      ServerName apachefrontend.example.com
>> >>>> >      RedirectMatch ^/(.*)    https://apachefrontend.example.com/$1
>> >>>> > </VirtualHost>
>> >>>> >
>> >>>>
>> >>>> to:
>> >>>>
>> >>>> <VirtualHost *:80>
>> >>>>      ServerName apachefrontend.example.com
>> >>>>        ServerAlias appserver1.example.com appserver2.example.com
>> >>>>
>> >>>>      RedirectMatch ^/(.*)    https://%{HTTP_HOST}/$1
>> >>>> </VirtualHost>
>> >>>>
>> >>>> Then get rid of these two:
>> >>>>
>> >>>> > <VirtualHost *:80>
>> >>>> >      ServerName appserver1.example.com
>> >>>> >      ProxyRequests Off
>> >>>> >      ProxyPass / http://appserver1.backend/
>> >>>> >      ProxyPassReverse / http://appserver1.backend/
>> >>>> > </VirtualHost>
>> >>>> >
>> >>>> > <VirtualHost *:80>
>> >>>> >      ServerName appserver2.example.com
>> >>>> >      ProxyRequests Off
>> >>>> >      ProxyPass / http://appserver2.backend/
>> >>>> >      ProxyPassReverse / http://appserver2.backend/
>> >>>> > </VirtualHost>
>> >>>> > ..
>> >>>>
>> >>>> More specific convert them to ssl vhosts:
>> >>>>
>> >>>> <VirtualHost *:443>
>> >>>>      ServerName appserver1.example.com
>> >>>>      ProxyRequests Off
>> >>>>      ProxyPass / http://appserver1.backend/
>> >>>>      ProxyPassReverse / http://appserver1.backend/
>> >>>> </VirtualHost>
>> >>>>
>> >>>> <VirtualHost *:443>
>> >>>>      ServerName appserver2.example.com
>> >>>>      ProxyRequests Off
>> >>>>      ProxyPass / http://appserver2.backend/
>> >>>>      ProxyPassReverse / http://appserver2.backend/
>> >>>> </VirtualHost>
>> >>>>
>> >>>> which will effectively do what you want which is terminate ssl on
the frontend.
>> >>>>
>> >>>> > Now,
>> >>>> >
>> >>>> > - If I go to "http://apachefrontend.example.com", I am
>> >>>> > correctly ending up at "https://apachefrontend.example.com";
>> >>>> >
>> >>>> > - If I go to "http://appserver1[2].example.com", I arrive to
>> >>>> > the backend servers allright, but only via the port 80.
>> >>>> >
>> >>>> > This behaviour is apparently correct, but so far I have not
found
>> >>>> > the right configuration options needed  to enforce the secure
>> >>>> > connection to the backend servers via the reverse proxy (I
may
>> >>>> > not enable SSL on the backend servers as they are running some
>> >>>> > privately managed applications and cannot be tweaked).
>> >>>> >
>> >>>> > Could someone kindly post an example of working configuration
>> >>>> > of the same type?
>> >>>> >
>> >>>> > Thanks ahead for any advice!
>> >>>> >
>> >>>> > Andy.
>> >>>> >
>> >>>> >
>> >>>> >
>> >>>
>> >>>
>> >>
>> >
>
>

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